package xyz.fivefaith.cloud.gateway.filter;

import cn.hutool.core.map.MapUtil;
import cn.hutool.core.util.ObjectUtil;

import jakarta.annotation.Resource;

import lombok.extern.slf4j.Slf4j;

import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.core.Ordered;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.stereotype.Component;
import org.springframework.util.MultiValueMap;
import org.springframework.web.server.ServerWebExchange;

import reactor.core.publisher.Mono;

import xyz.fivefaith.cloud.gateway.config.properties.ApiDecryptProperties;
import xyz.fivefaith.cloud.gateway.config.properties.CustomGatewayProperties;
import xyz.fivefaith.cloud.gateway.utils.WebFluxUtils;
import xyz.fivefaith.tool.common.util.JacksonUtil;

/**
 * 全局日志过滤器
 *
 * <p>用于打印请求执行参数与响应时间等等
 *
 * @author Lion Li
 */
@Slf4j
@Component
public class GlobalLogFilter implements GlobalFilter, Ordered {

    @Resource private CustomGatewayProperties customGatewayProperties;
    @Resource private ApiDecryptProperties apiDecryptProperties;

    private static final String START_TIME = "startTime";

    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
        if (!customGatewayProperties.getRequestLog()) {
            return chain.filter(exchange);
        }
        ServerHttpRequest request = exchange.getRequest();
        String path = WebFluxUtils.getOriginalRequestUrl(exchange);
        String url = request.getMethod().name() + " " + path;

        // 打印请求参数
        if (WebFluxUtils.isJsonRequest(exchange)) {
            if (apiDecryptProperties.getEnabled()
                    && ObjectUtil.isNotNull(
                            request.getHeaders().getFirst(apiDecryptProperties.getHeaderFlag()))) {
                log.info("[PLUS]开始请求 => URL[{}],参数类型[encrypt]", url);
            } else {
                String jsonParam = WebFluxUtils.resolveBodyFromCacheRequest(exchange);
                log.info("[PLUS]开始请求 => URL[{}],参数类型[json],参数:[{}]", url, jsonParam);
            }
        } else {
            MultiValueMap<String, String> parameterMap = request.getQueryParams();
            if (MapUtil.isNotEmpty(parameterMap)) {
                String parameters = JacksonUtil.toJson(parameterMap);
                log.info("[PLUS]开始请求 => URL[{}],参数类型[param],参数:[{}]", url, parameters);
            } else {
                log.info("[PLUS]开始请求 => URL[{}],无参数", url);
            }
        }

        exchange.getAttributes().put(START_TIME, System.currentTimeMillis());
        return chain.filter(exchange)
                .then(
                        Mono.fromRunnable(
                                () -> {
                                    Long startTime = exchange.getAttribute(START_TIME);
                                    if (startTime != null) {
                                        long executeTime = (System.currentTimeMillis() - startTime);
                                        log.info(
                                                "[PLUS]结束请求 => URL[{}],耗时:[{}]毫秒",
                                                url,
                                                executeTime);
                                    }
                                }));
    }

    @Override
    public int getOrder() {
        // 日志处理器在负载均衡器之后执行 负载均衡器会导致线程切换 无法获取上下文内容
        // 如需在日志内操作线程上下文 例如获取登录用户数据等 可以打开下方注释代码
        // return ReactiveLoadBalancerClientFilter.LOAD_BALANCER_CLIENT_FILTER_ORDER - 1;
        return Ordered.LOWEST_PRECEDENCE;
    }
}
